Pertitio principii is Latin for Begging the question
[n] - the logical fallacy of assuming the conclusion in the premises
petitio noun the logical fallacy of assuming the conclusion in the premises; begging the question
, or begging the question, is a fallacy involving the assumption as premisses of one or more propositions which are identical with (or in a simple fashion equivalent to) the conclusion to be proved, or which would require the conclusion for their proof, or which are stronger than the conclusion and contain it as a particular case or otherwise as an...